Method for producing a coupling on a pipe and device for producing said coupling

a technology of pipe and socket, which is applied in the field of making sockets on pipes, can solve the problems of saving significant material expenses, the fitting is exposed to the greatest stress, etc., and achieves the effects of increasing material expenses, increasing wall thickness inherently, and increasing wall thickness

US7770429B2Active Publication Date: 2010-08-10FFG WERKE +1
15 Cites 9 Cited by

Patent Information

Authority / Receiving Office
US · United States
Patent Type
Patents(United States)
Current Assignee / Owner
Publication Date
2010-08-10

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
  • Figure 3
    Figure 3
Patent Text Reader

Abstract

In a method for producing a coupling on a pipe, preferably consisting of copper or steel or Cu—, Ni—, Fe— alloys, by way of a preferably graduated or one-stage expansion of the pipe end to create a much larger difference in diameter, an expansion tool is introduced axially into the end of the pipe. Once the expansion tool has been introduced into the pipe end, the region of the pipe end that is to be or has been expanded is completely or partially compressed, by a force acting axially on the pipe end, so that the external diameter of the pipe end that is to be processed is delimited by one or more shaping jaws that completely or partially surround the pipe end. The invention also relates to a device for producing a coupling on a pipe end according to the method.
Need to check novelty before this filing date? Find Prior Art

Description

BACKGROUND AND SUMMARY OF THE INVENTION

[0001] This invention relates to a method of making a socket on a pipe, preferably of copper or steel or alloys of Cu, Ni and Fe, by means of a preferably multi-step or single-step expansion of the pipe end with a large jump in diameter. For effecting the expansion, the pipe end is introduced axially into an expansion tool. The invention further relates to an apparatus for making a socket of such a type.

[0002] In the manufacture of copper or steel fittings from pipes, the sockets at the pipe ends are made preferably by a stepped expansion of the pipe portion. In each required step the wall thickness is reduced during expansion of the pipe. It has been found, for example, that in case of a pipe having a nominal width >50 mm and a wall thickness of 2.7 mm, after a two-step expansion the wall thickness is only 2.4 mm. In the last step of the expansion where the thinnest wall thickness occurs, the pipe end is, as a rule, inwardly flanged to ensure...

Examples

Embodiment Construction

[0012]The finished pipe 1 shown in FIG. 1 has a wall thickness d1 which corresponds to the wall thickness of the original pipe material. Following a two-step expansion, the pipe has a first conical part 5, an adjoining first cylindrical part 7 having a wall thickness d7 which is reduced with respect to the wall thickness d1 in accordance with the extent of the expansion, a second conical part 6, an adjoining second cylindrical part 8 and an inwardly bent flange 9. The second cylindrical part 8 has a wall thickness d8 which, prior to providing the flange 9, was increased to the required extent by means of the upsetting step according to the invention. The wall thickness d8 should at least equal the wall thickness d7. It has even been found advantageous to bring the wall thickness up to the wall thickness d1.

[0013]In FIG. 2 the multi-step expansion tool 2 has already been axially pressed into the pipe end. The shape of the socket having parts 5 to 8 is formed on the inside by the part...